399999998 has 16 divisors (see below), whose sum is σ = 607551840. Its totient is φ = 197488896.

The previous prime is 399999959. The next prime is 400000009. The reversal of 399999998 is 899999993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256790 + ... + 258342.

It is an arithmetic number, because the mean of its divisors is an integer number (37971990).

Almost surely, 2^399999998 is an apocalyptic number.

399999998 is a deficient number, since it is larger than the sum of its proper divisors (207551842).

399999998 is a wasteful number, since it uses less digits than its factorization.

399999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091.

The product of its digits is 114791256, while the sum is 74.

The square root of 399999998 is about 19999.9999500000. Note that the first 4 decimals coincide. The cubic root of 399999998 is about 736.8062985001.

It can be divided in two parts, 3 and 99999998, that added together give a palindrome (100000001).

The spelling of 399999998 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".